making plastaline into crystocal

[gerkass]

if i were to sculpt something in plastaline and then cast it in order to make the end result a character made out of crystical plaster , , ,what would be the best method of creating the mould?
silicone?
latex?
alginate?
or some other substance?

trying to stick to low budget too so if u have ideas please send em this way.

silicone is obviosly the easiest way but again im trying to stick to a budget.
:ninja

 

[CSMacLaren]

I understand that plasticine contains something that prohibits molding compound from curing. Try Klean Clay or some oil-based clay.

 

[weaselflinger]

Some (but not all, chavant NSP for example does not) plasticines contain sulfur which will mess with certain types of silicone.

I've never heard of the type of plaster you mentioned, or what the sculpture looks like, but casting plaster in plaster molds used to be very common (if you do everything correctly).

 

[AnsonJames]

It's okay to use Silicone rubber on plastiline - it's a branded Chavant and doesn't contain sulphur.

 

[franz bolo]

My friends suggested this:

If you're just making one copy and the size of the part is small to medium, then Alginate + plaster bandage (or plaster shell) would be the cheapest way to go.

Another cheap method would be to use a dragon skin silicone glove mold with plaster shell.

Making a Brush-On Glove Mold Using Dragon Skin® and Casting a Faux Wood Reproduction | Smooth-On

FB